package cn.tedu.sp06.fb;

import cn.tedu.web.util.JsonResult;
import com.google.inject.internal.cglib.core.$ReflectUtils;
import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;

import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

@Component
public class ItemFB implements FallbackProvider {
    /*
    返回一个service-id,表示当前降级类是针对哪个后台服务的降级类
     --item-service  只针对商品服务降级
     --*        对所有服务都应用这个降级类
     -- null    等同于 *
     */
    @Override
    public String getRoute() {
        return "item-service";
    }
    //发回给客户端的降级响应--访问出错时
    @Override
    public ClientHttpResponse fallbackResponse(String route,
                                               Throwable cause) {
        return new ClientHttpResponse() {
            @Override
            public HttpStatus getStatusCode() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR;
            }

            @Override
            public int getRawStatusCode() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR.value();
            }

            @Override
            public String getStatusText() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR.getReasonPhrase();
            }

            @Override
            public void close() {

            }

            @Override
            public InputStream getBody() throws IOException {
                String json = JsonResult.err()
                        .code(500)
                        .msg("调用出错")
                        .toString();
                return new ByteArrayInputStream(
                        json.getBytes("UTF-8"));
            }

            @Override
            public HttpHeaders getHeaders() {
                HttpHeaders h = new HttpHeaders();
                h.add("Content-Type",
                        "application/json;" +
                                "charset=UTF-8");
                return h;
            }
        };
    }
}
